pep8, pyflakes
Add clearfix in sorting slidedown

This makes all sorting groups appear horizontally aligned.
Add userbadge support based proposal sorting (votedetail)

This adds proposal support by each votedetail enabled userbadge to Solr
and allows to sort by support of these user groups.

Note that this only adds score (pro minus con) and not most votes, most
ayes, most nays, controversy for the user badges, as this wouldn't
easily fit within the current UI.
Allow to export proposal and comment ratings
Add optional user attributes for statistical evaluation

This allows to configure a set of attributes to be queried in a separate
page of the user settings. These attributes aren't shown in the UI and
are meant to be used for statistical evaluation